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In planet Earth, insects are the most dominant diverse and important group. The terrestrial diversity of insect is large as compare to insect live in other habitat. Insects possess an amazing diversity in morphological characters as well as in genetic diversity that's helps in survival in different environmental conditions. The great insect diversity is indeed an intrinsic part of the Earth's ecosystem and they are what make the ecosystem. Thus, the diversity and ecological importance of insects make them very valuable for studies of biodiversity. Similarly, Insects have great potential for understanding ecosystem and to measure the ecosystem health but the limited knowledge and resources increase the difficulty of work on insect biodiversity The conservation of insect biodiversity is very important for the investigation of relation between climatic factors and insect diversity with respect to impact of human as well as increasing globalization. The limited research study on global insect diversity is harmful in advance study and research field with respect to advance evolutionary insect ecology. This book chapter explores the conservation of various species with their diversity. It includes assessments of insect's population as compare to bio-ecology changes.